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Question 437

How is positive feedback supplied in a Colpitts oscillator?

  1. Through a tapped coil
  2. Through link coupling
  3. Through a capacitive dividerCorrect answer
  4. Through a neutralizing capacitor

Explanation

The Colpitts oscillator takes its feedback from the junction of two capacitors connected in series across the tank. The ratio of that capacitive divider sets how much of the tank voltage is returned to the input to sustain oscillation.

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Question 437: How is positive feedback supplied in a Colpitts oscillator? · FCC Amateur Extra Class (Element 4) · Questena